path: root/mysql-test/t/lock_multi.test

-- source include/not_embedded.inc

# Save the initial number of concurrent sessions
--source include/count_sessions.inc

--disable_warnings
drop table if exists t1,t2;
--enable_warnings

# Test to see if select will get the lock ahead of low priority update

connect (locker,localhost,root,,);
connect (reader,localhost,root,,);
connect (writer,localhost,root,,);

connection locker;
create table t1(n int);
insert into t1 values (1);
lock tables t1 write;
connection writer;
send
update low_priority t1 set n = 4;
connection reader;
# Sleep a bit till the update of connection writer is in work and hangs
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Table lock" and info = "update low_priority t1 set n = 4";
--source include/wait_condition.inc
send
select n from t1;
connection locker;
# Sleep a bit till the select of connection reader is in work and hangs
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Table lock" and info = "select n from t1";
--source include/wait_condition.inc
unlock tables;
connection writer;
reap;
connection reader;
reap;
drop table t1;

connection locker;
create table t1(n int);
insert into t1 values (1);
lock tables t1 read;
connection writer;
send
update low_priority t1 set n = 4;
connection reader;
# Sleep a bit till the update of connection writer is in work and hangs
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Table Lock" and info = "update low_priority t1 set n = 4";
--source include/wait_condition.inc
select n from t1;
connection locker;
unlock tables;
connection writer;
reap;
drop table t1;

#
# Test problem when using locks with multi-updates
# It should not block when multi-update is reading on a read-locked table
#

connection locker;
create table t1 (a int, b int);
create table t2 (c int, d int);
insert into t1 values(1,1);
insert into t1 values(2,2);
insert into t2 values(1,2);
lock table t1 read;
connection writer;
update t1,t2 set c=a where b=d;
connection reader;
select c from t2;
connection locker;
drop table t1;
drop table t2;

#
# Test problem when using locks on many tables and dropping a table that
# is to-be-locked by another thread
#
#
connection locker;
create table t1 (a int);
create table t2 (a int);
lock table t1 write, t2 write;
connection reader;
send
insert t1 select * from t2;
connection locker;
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Table Lock" and info = "insert t1 select * from t2";
--source include/wait_condition.inc
drop table t2;
connection reader;
--error ER_NO_SUCH_TABLE
reap;
connection locker;
drop table t1;

#
# Same test as above, but with the dropped table locked twice
#

connection locker;
create table t1 (a int);
create table t2 (a int);
lock table t1 write, t2 write, t1 as t1_2 write, t2 as t2_2 write;
connection reader;
send
insert t1 select * from t2;
connection locker;
# Sleep a bit till the insert of connection reader is in work and hangs
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Table Lock" and info = "insert t1 select * from t2";
--source include/wait_condition.inc
drop table t2;
connection reader;
--error ER_NO_SUCH_TABLE
reap;
connection locker;
drop table t1;


--echo End of 4.1 tests

#
# Bug#9998 MySQL client hangs on USE "database"
#
create table t1(a int);
lock tables t1 write;
connection reader;
show columns from t1;
connection locker;
unlock tables;
drop table t1;

#
# Bug#16986 Deadlock condition with MyISAM tables
#

# Need a matching user in mysql.user for multi-table select
--source include/add_anonymous_users.inc

connection locker;
USE mysql;
LOCK TABLES columns_priv WRITE, db WRITE, host WRITE, user WRITE;
FLUSH TABLES;
#
connection reader;
USE mysql;
# Note:  This must be a multi-table select, otherwise the deadlock will not occur
send
SELECT user.Select_priv FROM user, db WHERE user.user = db.user LIMIT 1;
#
connection locker;
# Sleep a bit till the select of connection reader is in work and hangs
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table" and info =
  "SELECT user.Select_priv FROM user, db WHERE user.user = db.user LIMIT 1";
--source include/wait_condition.inc
# Make test case independent from earlier grants.
--replace_result "Table is already up to date" "OK"
OPTIMIZE TABLES columns_priv, db, host, user;
UNLOCK TABLES;
#
connection reader;
reap;
USE test;
#
connection locker;
use test;
#
connection default;
#
# Test if CREATE TABLE with LOCK TABLE deadlocks.
#
connection writer;
CREATE TABLE t1 (c1 int);
LOCK TABLE t1 WRITE;
#
# This waits until t1 is unlocked.
connection locker;
send
FLUSH TABLES WITH READ LOCK;
#
connection writer;
# Sleep a bit till the flush of connection locker is in work and hangs
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Flushing tables" and info = "FLUSH TABLES WITH READ LOCK";
--source include/wait_condition.inc
# This must not block.
CREATE TABLE t2 (c1 int);
UNLOCK TABLES;
#
# This awakes now.
connection locker;
reap;
UNLOCK TABLES;
#
connection default;
DROP TABLE t1, t2;
#
# Test if CREATE TABLE SELECT with LOCK TABLE deadlocks.
#
connection writer;
CREATE TABLE t1 (c1 int);
LOCK TABLE t1 WRITE;
#
# This waits until t1 is unlocked.
connection locker;
send
FLUSH TABLES WITH READ LOCK;
#
# This must not block.
connection writer;
# Sleep a bit till the flush of connection locker is in work and hangs
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Flushing tables" and info = "FLUSH TABLES WITH READ LOCK";
--source include/wait_condition.inc
--error ER_TABLE_NOT_LOCKED
CREATE TABLE t2 AS SELECT * FROM t1;
UNLOCK TABLES;
#
# This awakes now.
connection locker;
reap;
UNLOCK TABLES;
#
connection default;
DROP TABLE t1;

--source include/delete_anonymous_users.inc

#
# Bug#19815 CREATE/RENAME/DROP DATABASE can deadlock on a global read lock
#
connect (con1,localhost,root,,);
connect (con2,localhost,root,,);
#
connection con1;
CREATE DATABASE mysqltest_1;
FLUSH TABLES WITH READ LOCK;
#
# With bug in place: acquire LOCK_mysql_create_table and
# wait in wait_if_global_read_lock().
connection con2;
send
DROP DATABASE mysqltest_1;
#
# With bug in place: try to acquire LOCK_mysql_create_table...
# When fixed: Reject dropping db because of the read lock.
connection con1;
# Wait a bit so that the session con2 is in state "Waiting for release of readlock"
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for release of readlock"
  and info = "DROP DATABASE mysqltest_1";
--source include/wait_condition.inc
--error ER_CANT_UPDATE_WITH_READLOCK
DROP DATABASE mysqltest_1;
UNLOCK TABLES;
#
connection con2;
reap;
#
connection default;
disconnect con1;
disconnect con2;
# This must have been dropped by connection 2 already,
# which waited until the global read lock was released.
--error ER_DB_DROP_EXISTS
DROP DATABASE mysqltest_1;

#
# Bug#17264 MySQL Server freeze
#
connection locker;
# Disable warnings to allow test to run also without InnoDB
--disable_warnings
create table t1 (f1 int(12) unsigned not null auto_increment, primary key(f1)) engine=innodb;
--enable_warnings
lock tables t1 write;
connection writer;
send
alter table t1 auto_increment=0;
connection reader;
# Wait till connection writer is blocked
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Table Lock" and info = "alter table t1 auto_increment=0";
--source include/wait_condition.inc
send
alter table t1 auto_increment=0;
connection locker;
# Wait till connection reader is blocked
let $wait_condition=
  select count(*) = 2 from information_schema.processlist
  where state = "Table Lock" and info = "alter table t1 auto_increment=0";
--source include/wait_condition.inc
unlock tables;
connection writer;
reap;
connection reader;
reap;
connection locker;
drop table t1;

#
# Bug#43230: SELECT ... FOR UPDATE can hang with FLUSH TABLES WITH READ LOCK indefinitely
#

connect (con1,localhost,root,,);
connect (con2,localhost,root,,);
connect (con3,localhost,root,,);
connect (con4,localhost,root,,);
connect (con5,localhost,root,,);

create table t1 (a int);
create table t2 like t1;

connection con1;
--echo # con1
lock tables t1 write;
connection con2;
--echo # con2
send flush tables with read lock;
connection con5;
--echo # con5
let $show_statement= SHOW PROCESSLIST;
let $field= State;
let $condition= = 'Flushing tables';
--source include/wait_show_condition.inc
--echo # global read lock is taken
connection con3;
--echo # con3
send select * from t2 for update;
connection con5;
let $show_statement= SHOW PROCESSLIST;
let $field= State;
let $condition= = 'Waiting for release of readlock';
--source include/wait_show_condition.inc
--echo # waiting for release of read lock
connection con4;
--echo # con4
--echo # would hang and later cause a deadlock
flush tables t2;
connection con1;
--echo # clean up
unlock tables;
connection con2;
--reap
unlock tables;
connection con3;
--reap
connection default;
disconnect con5;
disconnect con4;
disconnect con3;
disconnect con2;
disconnect con1;

drop table t1,t2;

--echo #
--echo # Lightweight version:
--echo # Ensure that the wait for a GRL is done before opening tables.
--echo #

connect (con1,localhost,root,,);
connect (con2,localhost,root,,);

create table t1 (a int);
create table t2 like t1;

--echo #
--echo # UPDATE
--echo #

connection default;
--echo # default
flush tables with read lock;
connection con1;
--echo # con1
send update t2 set a = 1;
connection default;
--echo # default
let $show_statement= SHOW PROCESSLIST;
let $field= State;
let $condition= = 'Waiting for release of readlock';
--source include/wait_show_condition.inc
--echo # statement is waiting for release of read lock
connection con2;
--echo # con2
flush table t2;
connection default;
--echo # default
unlock tables;
connection con1;
--echo # con1
--reap

--echo #
--echo # LOCK TABLES .. WRITE
--echo #

connection default;
--echo # default
flush tables with read lock;
connection con1;
--echo # con1
send lock tables t2 write;
connection default;
--echo # default
let $show_statement= SHOW PROCESSLIST;
let $field= State;
let $condition= = 'Waiting for release of readlock';
--source include/wait_show_condition.inc
--echo # statement is waiting for release of read lock
connection con2;
--echo # con2
flush table t2;
connection default;
--echo # default
unlock tables;
connection con1;
--echo # con1
--reap
unlock tables;

connection default;
disconnect con2;
disconnect con1;

drop table t1,t2;


--echo End of 5.0 tests


#
# Bug#21281 Pending write lock is incorrectly removed when its
#           statement being KILLed
#
create table t1 (i int);
connection locker;
lock table t1 read;
connection writer;
send
update t1 set i= 10;
connection reader;
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Table Lock" and info = "update t1 set i= 10";
--source include/wait_condition.inc
send
select * from t1;
connection default;
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Table Lock" and info = "select * from t1";
--source include/wait_condition.inc
let $ID= `select id from information_schema.processlist where state = "Table Lock" and info = "update t1 set i= 10"`;
--replace_result $ID ID
eval kill query $ID;
connection reader;
--reap
connection writer;
--error ER_QUERY_INTERRUPTED
--reap
connection locker;
unlock tables;
connection default;
drop table t1;

# Disconnect sessions used in many subtests above
disconnect locker;
disconnect reader;
disconnect writer;


#
# Bug#32395 Alter table under a impending global read lock causes a server crash
#

#
# Test ALTER TABLE under LOCK TABLES and FLUSH TABLES WITH READ LOCK
#

--disable_warnings
drop table if exists t1;
--enable_warnings
create table t1 (i int);
connect (flush,localhost,root,,test,,);
connection default;
--echo connection: default
lock tables t1 write;
connection flush;
--echo connection: flush
--send flush tables with read lock;
connection default;
--echo connection: default
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Flushing tables";
--source include/wait_condition.inc
alter table t1 add column j int;
connect (insert,localhost,root,,test,,);
connection insert;
--echo connection: insert
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Flushing tables";
--source include/wait_condition.inc
--send insert into t1 values (1,2);
--echo connection: default
connection default;
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for release of readlock";
--source include/wait_condition.inc
unlock tables;
connection flush;
--echo connection: flush
--reap
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for release of readlock";
--source include/wait_condition.inc
select * from t1;
unlock tables;
connection insert;
--reap
connection default;
let $wait_condition=
  select count(*) = 1 from t1;
--source include/wait_condition.inc
select * from t1;
drop table t1;
disconnect flush;
disconnect insert;

#
# Test that FLUSH TABLES under LOCK TABLES protects write locked tables
# from a impending FLUSH TABLES WITH READ LOCK
#

--disable_warnings
drop table if exists t1;
--enable_warnings
create table t1 (i int);
connect (flush,localhost,root,,test,,);
connection default;
--echo connection: default
lock tables t1 write;
connection flush;
--echo connection: flush
--send flush tables with read lock;
connection default;
--echo connection: default
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Flushing tables";
--source include/wait_condition.inc
flush tables;
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Flushing tables";
--source include/wait_condition.inc
unlock tables;
let $wait_condition=
  select count(*) = 0 from information_schema.processlist
  where state = "Flushing tables";
--source include/wait_condition.inc
connection flush;
--reap
connection default;
disconnect flush;
drop table t1;

#
# Bug#30331 Table_locks_waited shows inaccurate values
#

--disable_warnings
drop table if exists t1,t2;
--enable_warnings
create table t1 (a int);
flush status;
lock tables t1 read;
let $tlwa= `show status like 'Table_locks_waited'`;
connect (waiter,localhost,root,,);
connection waiter;
--send insert into t1 values(1);
connection default;
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Table Lock" and info = "insert into t1 values(1)";
--source include/wait_condition.inc
let $tlwb= `show status like 'Table_locks_waited'`;
unlock tables;
connection waiter;
--reap
connection default;
drop table t1;
disconnect waiter;
--disable_query_log
eval SET @tlwa= SUBSTRING_INDEX('$tlwa', '	', -1);
eval SET @tlwb= SUBSTRING_INDEX('$tlwb', '	', -1);
--enable_query_log
select @tlwa < @tlwb;

--echo End of 5.1 tests

# Wait till all disconnects are completed
--source include/wait_until_count_sessions.inc